e/Null dust solution

Information
has gloss	eng: A null dust solution (sometimes called a null fluid) is a Lorentzian manifold in which the Einstein tensor is null. Such a spacetime can be interpreted as an exact solution of Einstein's field equation, in which the only mass-energy present in the spacetime is due to some kind of massless radiation.
lexicalization	eng: null dust solution
instance of	e/Exact solutions in general relativity